What’s Vulnerable › Vulnerabilities

CVE-2023-53979: MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-22 · updated 2026-06-17
• Weakness: CWE-22

Description

MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.

Affected products

• mybb: 1.8.32

References

• https://fdlucifer.github.io/2023/01/17/mybb1-8-32-LFI-RCE/
• https://mybb.com/
• https://www.exploit-db.com/exploits/51213
• https://www.vulncheck.com/advisories/mybb-authenticated-remote-code-execution-via-chained-vulnerabilities
• https://www.cve.org/CVERecord?id=CVE-2022-45867

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